| abstract |
The invention concerns a compound of the formula (I):wherein, for example:R1 is of the formula -NHC(=O)Rb wherein Rb is, for example, (1-4C)alkyl;R2 and R3 are hydrogen or fluoro;R2 and R3 are hydrogen or fluoro;D is O;R4 and R5 are hydrogen, (1-4C)alkyl or AR-oxymethyl;AR is phenyl or phenyl(1-4C)alkyl;R6 is hydrogen;>A-B- is of the formula >C=C(Ra)-, >CHCHRa-, or >C(OH)CHRa- (> represents two single bonds) wherein Ra is hydrogen or (1-4C)alkyl;and pharmaceutically-acceptable salts thereof; processes for their preparation; pharmaceutical compositions containing them and their use as antibacterial agents. |